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If you mean element, that would be Hydrogen. If you mean compound, that would be Chloride. If you mean in sea salts that make up seawater, that would be Sodium. However, Chloride and Sodium go hand in hand, so Chloride gains an electron and Sodium loses one; then the two bond to create salt.

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Q: What is the second most abundant ion in seawater is?
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Which ion most abundant in seawater?

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